The rotation - Lithium depletion correlation in the beta Pictoris association and LDB age determination

 

Autores
Messina, S.; Lanzafame, A. C.; Feiden, G. A.; Millward, M.; Desidera, S.; Buccino, Andrea Paola; Curtis, I.; Jofre, Jorge Emiliano; Kehusmaa, P.; Medhi, B. J.; Monard, B.; Petrucci, Romina Paola
Tipo de recurso
artículo
Estado
Versión publicada
Año de publicación
2016
País
Argentina
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio
CONICET Digital (CONICET)
Descripción
There is evidence in the 125-Myr Pleiades cluster, and more recently in the 5-Myr NGC 2264 cluster, that rotation plays a key role in the Lithium (Li) depletion processes among low-mass stars. Fast rotators appear to be less Li-depleted than equal-mass slow rotators. We intend to explore the existence of a Li depletion - rotation connection among the beta Pictoris members at an age of about 24 Myr, and to use such correlation either to confirm or to improve the age estimate based on the Lithium Depletion Boundary (LDB) modeling. We have photometrically monitored all the known members of the beta Pictoris association with at least one Lithium equivalent width (Li EW) measurement from the literature. We measured the rotation periods of 30 members for the first time and retrieved from the literature the rotation periods for other 36 members, building a catalogue of 66 members with measured rotation period and Li EW. We find that in the 0.3 < M < 0.8 Msun range, there is a strong correlation between rotation and Li EW. For higher mass stars, no significant correlation is found. For very low mass stars in the Li depletion onset, at about 0.1 Msun, data are too few to infer a significant correlation. The observed Li EWs are compared with those predicted by the Dartmouth stellar evolutionary models that incorporate the effects of magnetic fields. After decorrelating the Li EW from the rotation period, we find that the hot side of the LDB is fitted well by Li EW values corresponding to an age of 25±3 Myr in good agreement with independent estimates from the literature.
Idioma
inglés
OAI Identifier
oai:ri.conicet.gov.ar:11336/21706
Enlace del recurso
http://hdl.handle.net/11336/21706
Nivel de acceso
Acceso abierto
Materia
Stars: activity
Stars: late-type
Stars: rotation
Stars: starspot
Stars: individual: beta Pictoris association
Stars: abundances
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS